Reddit reviews OEM TOOLS 27066 Coolant System Refiller Kit, 3 Adapters | Remove Air Trapped in Cooling System, Test Radiator and Heating Core Lines for Leaks | Fits Radiator Necks and Coolant Reservoirs
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EASY COMPLETE COOLANT SYSTEM REFILLER: Refills the entire cooling system including the Heater CoreHUGE TIME SAVER: Eliminate time consuming bleeding and purging, and completely remove all trapped air from your cooling system; Removing air through a radiator burp is much more time intensiveDISCOVER LEAKS: It’s easy to check for leaks while under vacuum; if your vacuum level decreases while all valves are off, you have a leak in your systemWIDELY USEFUL: Comes with three adapters that fit most common radiator necks and coolant reservoirsSIMPLE TO USE: All you need to use this coolant system vacuum kit is a shop air compressor; The included venturi valve turns any air compressor input into a strong vacuum force
using something like this to refill is kind of important if you want to address an airpocket in your heater core. If you just pour it into the radiator you’ll probably still have air in the heater core. There are other ways to bleed the air out like Reving the engine on an incline or some vehicle has bleeder screws. But, the vacuum filler is by far the easiest